Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover read-only, idempotent, closed-world and non-destructive, and the description adds genuinely new context: the tool is free, needs no account/payment/credits, and explicitly performs no image generation, bookings, or identity inference. It stops short of describing the shape of the returned plan, which matters since there is no output schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three tight sentences with no filler; the exclusions pack real information. The 'Free; no account, payment or Gravitate credits' line is front-loaded before the purpose statement, which slightly delays the core verb but is defensible as a call-friction signal.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 5-param, read-only, no-output-schema tool, the description covers cost, trigger, scope limits and personalization inputs. The main residual gap is what the returned plan looks like (structure, length), which the agent has to discover by calling.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 60% schema coverage, the description compensates by tying persona ('single-dad/returning-to-dating context'), setting, photographer and the 15/30/60 minute options to the tailoring behavior. It also reinforces the persona constraint ('no inference about the user's identity'). Only locale goes unmentioned, and that is fully self-documented in the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and deliverable: a 'practical 15, 30 or 60 minute dating-photo shoot plan' that tailors curated advice to persona, setting and photographer. That is distinguishable from score_photo_observations (scoring) and get_service_status, though the boundary with get_photo_guidance is only implied, not stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

'Use when a user wants a practical 15, 30 or 60 minute dating-photo shoot plan' gives an explicit trigger condition. The closing exclusions (no image generation, bookings, or identity inference) add useful when-not boundaries, but no sibling tool is named as the alternative for out-of-scope requests.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.